hi @ErrorNull i experienced the invisible / invincible zombie spawn in a T5 appartment building POI. it wasn't spitting acid like @arramus reported above. had the same NRE consle pop up, which i disregarded til my buddy and i started getting beat on by something we couldnt see or kill. i didn't have any snuffkin z's installed as i find them corny as hell. i only had enzombies mod installed, with nudity. i love this mod, and want to use it but if im failing T5 clear quests and getting killed by ghosts i cant hit, its a deal breaker. hope it's fixed soon. keep up the good work. i encountered this once before back in a18/19 and it had to do with the server and client side game versions not being identical but im not sure if that's what's going on here. i dont think it is, but can't rule it out.